Ian Cheney explores this problem and its ramifications in his new documentary, through interviews with "Astronomers, cancer researchers, ecologists, and philosophers," which help make the movie into "an introduction to the science of the dark, and an exploration of the human relationship to the stars."

If you are on the lookout for dark sky, here's a helpful and interactive map (I would try Montana personally). And if you want to catch The City Dark, it will be at various festivals in July, including at Miami's Greek Film Festival from July 1-4 and the Indianapolis Film Festival on July 16th.